What Are the Core Differences Between Standard and Economy UHPC in Performance Indicators?

The distinction between standard and economic UHPC stems from differences in application scenario requirements. Their core performance differences lie in key dimensions such as strength, durability, and workability. As a supplier covering full-scenario needs, Qinglong Group, through precise mix design and production control, makes the two product types suitable for high-end landmark projects and ordinary decorative projects respectively, balancing performance and cost.

Mechanical properties: Standard type pursues ultimate strength, while economic type meets basic requirements. Standard UHPC has a cubic compressive strength of ≥150MPa, flexural strength of ≥25MPa, and fracture energy of ≥20kJ/m², suitable for scenarios with high mechanical performance requirements such as large-span components, load-bearing decoration, and complex shapes; economic UHPC has a compressive strength of ≥120MPa, flexural strength of ≥20MPa, and fracture energy of ≥12kJ/m², suitable for small decorative lines, landscape components, non-load-bearing exterior wall panels, and other scenarios. Qinglong's test data shows that the compressive strength of standard products is 25%-30% higher than that of economic products, and flexural strength is 20%-25% higher. In the oversized translucent components at Century Plaza on Nanjing East Road in Shanghai, standard UHPC achieved 12㎡ components without additional support thanks to its high mechanical performance; while economic products fully meet the daily load-bearing requirements in community landscape bench projects.

Durability: Standard type suits complex environments, while economic type works for conventional scenarios. Standard UHPC withstands ≥200 freeze-thaw cycles (strength loss rate ≤5%), with carbonation depth ≤3mm and chloride ion penetration coefficient ≤1×10⁻¹³m²/s, suitable for complex environments such as seaside, high humidity, and severe cold; economic products withstand ≥150 freeze-thaw cycles (strength loss rate ≤10%), with carbonation depth ≤5mm and chloride ion penetration coefficient ≤1×10⁻¹²m²/s, suitable for dry, non-corrosive conventional environments. In the water feature project at Changying Global 100 Fantasy Land in Hainan, standard UHPC showed no water seepage or efflorescence after long-term immersion; while economic products remain in good condition after 5 years of use in residential decorative line projects in inland cities. In addition, the 20-year strength decay rate of standard type is ≤3%, while that of economic type is about 5%-8%, so selection should be based on the project's design life.

Workability and molding precision: Standard type suits complex processes, while economic type meets conventional molding. Standard UHPC has a spread of ≥220mm, excellent cohesion, and no segregation or bleeding, suitable for casting complex shapes such as double-curved surfaces, hollow-out patterns, and ultra-thin structures, with molding precision ≤±2mm; economic products have a spread of ≥200mm, suitable for conventional shapes such as flat panels and simple lines, with molding precision ≤±3mm. In Qinglong's double-curved exterior wall panel project for the Guangxi Media Center, standard UHPC achieved precise molding of each unique panel thanks to its high workability; while economic products met molding requirements with conventional molds in the decorative line project at Qiangwei Garden in Zengcheng, Guangzhou. In addition, standard type has a longer initial setting time (4-6 hours), facilitating the casting of complex components; economic type has an initial setting time of 3-4 hours, suitable for rapid batch production.

Material composition: Differences in core ingredients determine the performance gap. Standard UHPC uses high-grade cement (P·O 52.5R), imported silica fume (purity ≥95%), high-hardness quartz sand (Mohs hardness 7), and copper-plated steel fibers (dosage 3%-4%), with cementitious material content ≥1000kg/m³; economic products use ordinary P·O 52.5 cement, domestic silica fume (purity ≥90%), mixed sand (quartz sand + river sand = 7:3), and polypropylene fibers (dosage 2%-3%), with cementitious material content of 800-900kg/m³. Material cost differences make standard type 30%-40% more expensive than economic type, but standard type has a lower total lifecycle cost, especially in complex environment projects, reducing later maintenance expenses. Qinglong provides standard products for the high-end projects of strategic partners such as Poly and China Overseas, and economic products for the ordinary projects of small and medium-sized developers, achieving precise adaptation.

The core performance differences between standard and economic UHPC stem from material composition and mix design. The former pursues ultimate performance for high-end scenarios, while the latter balances performance and cost to serve conventional needs. Qinglong Group produces the two product types on two specialized production lines, both passing strict testing to ensure compliance with industry standards. Customers are advised to make comprehensive decisions based on the project's mechanical requirements, usage environment, design life, and budget: for high-end landmarks, complex environments, and long-term use projects, standard type is preferred; for ordinary decoration, budget-sensitive, and short-term use projects, economic type is a suitable choice.